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The Heath telegraphic cipher for the use of flouring mills and flour merchants and their traveling salesmen for the economical and secret transmission of business telegrams ([1900])

Author: Heath, G. M.
Subject: Cipher and telegraph codes.
Publisher: La Crosse, Wisconsin : G. M. Heath
Language: English
Digitizing sponsor: Duke University Libraries
Book contributor: Nicholas Gessler
Collection: dultc; americana


128 p.

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